(Maps in order from favourite to least favourite)
Yemen - Looks great - lots of CQC, Mid range combat and long range combat. supports all playstyles
Desert Village - Looks amazing, Mostly CQC which I like (I use AK mostly), Love the sandstorm
City of Brass - Looks great, Love the layout even though you can suicide very often
Airstrip - Love the plane sequence (when its not glitchy) Great map after the cargo plane section
Facility - My favourite remastered UC2 map. Plays well, looks great as ice
Chateau - I used to like this map now I'm just tired of it. Zipline room camping is annoying
Museum - Way too much sniping for my liking but looks stunning
Syria - Team that controls the T-bolt zones will win. Visually blah
Highrise - Too big and cluttered. looks bad at night, looked great in the day
Molten Ruins - Loved flooded ruins, Hate molten ruins. The map looks horrible.. They really missed a great opportunity. If they had made the lighting a tad bit darker and made more cracks in the surface where you can see lava, this map could have been a real winner. Although it looks the worst, by far, of any map it still plays ok.
London Underground - Absolute worst and least favourite map IMO.Hate the train sequence. The map part has such a boring layout and looks colourless and blah. I much prefured the setting in single player/co-op adventure. its a complete mess.
At first I didn't want this flashback map pack thing, but 1) I'm sick of these maps 2) UC2 OG maps >>>>> UC3.. it would be nice to have a bunch of symetrical maps. Something UC3 lacks for some strange reason.
Best: Molten Ruins, by far. I loved it also in U2.
Worst: Museum, Yemen.
During the first weeks, people never chose Molten Ruins. I think they didn't know yet that it's actually the best map in the game. Now it's always chosen over every other map, seems like people have at last realised.